5(a)
The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow:
(i) Name the phase.
(ii) Label the parts 1, 2, and 3
(iii) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(iv) Draw well labelled diagrams of part 1 and 2 to show the structural differences between them.
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(i) Atrial systole.
(ii) The parts 1, 2, and 3 are:
- 1 → Pulmonary Artery
- 2 → Superior vena cava
- 3 → Aorta
(iii) Atrial muscles are contracting during this phase because tricuspid and bicuspid valves are open while semilunar valves at the roots of pulmonary artery and aorta are closed.
(iv) Part 1 is artery and part 2 is vein. Below diagram shows the structural differences between them:
